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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acd6be3af5c7ccbb6ed826f36296026f4494bcf26568e1fbc0476879a79c55f' 
  AND token = 'rR3RpgAXebQtJa7ExYU0jGF6biDC8xKTpZgSAQNcxZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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