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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ff991d6a911e578880bec9db12c5c2c82e291980c886f98c92fc2ab0ef86dd' 
  AND token = 'gLsOyc8ZIoV9uFEpVtWUKPlS9uSQ0TNj4ibR+dUZqsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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