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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996f2d80999c23c565bb0ae4d94711ca07c6564594aeebc2662d32d40111a439' 
  AND token = '8fAQOwygPmf+8W7YX65cZ/MFBdd6KD1d7B8SsLpoSYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}