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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60d29db0108b3d5f95f945054d340802ae753473810e24ddb662d43192a2acb' 
  AND token = 'Rnu1H8R23ZT6pRXb4Bv8UfeUJveZkEF4d2TAPrDeVv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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