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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525e567410ba8fdc16934bba2fdbf7f7faf696f3abb068174787d208d0bfc835' 
  AND token = '4vE39zzFgSvoHHOQLFjkf4sO5kUD0tou2oK6PjrXszk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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