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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00e563bbb4ee79c5f276f36e481cd206be5ba32e0b89b6adf3f9f849193c5c3' 
  AND token = 'EYlmtfJ/+6gj3M3dQ+6fWGwjpJ1MYwIvQOsNbURaI8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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