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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6026cc410ff12eded27863616def87ac888c62b9d53ddc003cb629f18741cc88' 
  AND token = 'gKYSrQ2gsk1zvDi4Dh4zmco8IcH9x45dTKx6q04CJEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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