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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc126efb012a38d1b99fd6434d979856eea91fff4ff380ef8a532ae7d71e63fb' 
  AND token = 'el/rh9P6Itm98R4KWGr5ANq9FCmOu804Kofd76FA1eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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