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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0322f090e5864498b008c4086f8db993e3119871c9696ccdda706a9e57d9de6' 
  AND token = 'NRx1wcgVl8kkYxrjIsrKwI8VGr5Z3TsYRDEJ1dlgyLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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