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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d4276e2b93de785c1396ea3570c7f5ab783faa6b89fcb519c81ff02076a5cd' 
  AND token = 'O17KLv6jPZrm1q16VdhAw8aIolOecP+28bFYxVW2DcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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