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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8b0abf92104d32e1b9dac767a958107108a1f9ef54ac9ad2630a5413cc1f75' 
  AND token = '9+rdG5CMWU1IhGd00t4+FPQMZWgsqhS3OsgLwKeK7OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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