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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c942ae8ad5b52aa66f37acd7cc41795ee86e4143dc8a77955e12c9b60613864' 
  AND token = 'B3H03aIuZQnUwg3EezcsaxE2lovB9zfe5boqn0TV0oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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