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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0ef4ac3e3956afe7adc2cce2ec8d215f99097e4ace3913c343dacc3e116ac4' 
  AND token = 'Kgae7PW3kKKEkXsUn7Jv5cZGD71uzMbG67ls7L9V4GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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