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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c935c4f1dfa16ec33b15f137fb5be31982fada7f9b7fb893c393c1a12fbd55' 
  AND token = '+l18pvo81RIUaQpNIEZ6sniCRxR3asv71NUHKgtXgLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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