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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1b45b115a5bc3cfc07cae08e2acd52781a0bba75b1fc35aef5ba2ae6dd51ec' 
  AND token = '2v0Xt/LDkGiWdhlXkatHnB/n+4tN/PCeZJhkOswQOXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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