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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38301733d4117ce538414d69fde3fb5aa1770ffb315c17d392ad6133be11c674' 
  AND token = 'vIar5K54fjXOh0lQeoJvTsQQ4833g71FcAYQbI3NL+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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