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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5a149b6b38a293380c3413681ac29d32e928a1949875d4472247e08a00fba8' 
  AND token = 'mqo+snE5PP20Z+/Loj5V18PFDgW82oatF5K+b3KdzsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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