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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac786ceff0cc2bb7f9d744d9e9391b8a6c92164af0cafd0fe902da20af7b6a0' 
  AND token = 'LHPIXttToyjSS47OqYSpSIp0nZJhB2d4yRGfnSUQjOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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