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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e7e208253ada297cddfd0d435917493b25c8d8da7750005ce38fb8dea01424' 
  AND token = 'KRcYQyZDogad99ph8lQqcpiJJ1Ww8tUByMzJgdRvkXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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