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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed68354476083f262d1b109c8670435d9257f39940d748bbd810298db7a24d0' 
  AND token = 'NM+CKtBEbyqlTXceZD3CgC9g8xbjL4q11sPO3Q2oBNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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