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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b930db8c046a99fa886221f3d8a07c25a34932b2225b46a5841ea2182f20b6' 
  AND token = 'NAGIjT9ccAInvJ8WCM24PEK/W1/cvxfTlhOiSNEyU04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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