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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8774fa7f3c77c8f45821f116548e7cb3bf11a6bd4b563519f8ba9bccde57e8ee' 
  AND token = 'K32uDDiKKeRClE7RbIahMNZkdaDYom3XntBdXvA5u8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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