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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab24629419034d2685507e5e262eb7ca462ced706a3eec09c47f83ac09a9853' 
  AND token = 'V02IqVOhc4wzEz2SjGJL9GzzhGXO86tCRjyVaXbd2/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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