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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bf6683781dd83678c4fa7c1aee22bf86608a3ac3c9550d8ea98422f4096054' 
  AND token = '5Bc1L0oSbJr+O4fjILsOyxK4WBUtcyRNUwcuQ7g4+Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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