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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b775dda6076a3e29dd1f41727057935e955e332f1605a61331012ed80364ab9e' 
  AND token = 'X+pKsCQv0MPvZghz5RIboiItZlNErwrlRa7RU0wx9Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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