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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4a8fd95a9334cef2a3899a05172dcfa36337ef2af763b95508e82e502303be' 
  AND token = 'rfFs/U/g9tjwvGPgG+TzGbtg+B2dYUeczT263BviiSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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