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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f41b72764748e273ccd56c84969f022c8daab841217468de9d590b1e0e853c' 
  AND token = 'kFRvTI6TCf3cqAeKIoH0iPVgQI3EEKl5PmT6xoQsCio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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