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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24a51c524df6c933b915311f866ef8aca43e8714dcae154a49f6b95cd344ab4' 
  AND token = 'aJz2acbARi2O+GkLKjUSOFF9O4K1XZigRSx1CpLgHQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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