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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9158867cfc662e1f676ce2e7c115850ffa893afc3f73176b50d7f68b3667b2e0' 
  AND token = 'PvZ2cWn26Pau8ppP3eBrfb0KInEM+8TNYuG9Xf2J5ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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