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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9ed3c11d8fc6ff204092edc14c8077457db76369bc54d7a641b7feccc1f88c' 
  AND token = 'SPP1Qhio2kmsShgiHJnYYZwj+aijkSxkfRWgju0K7qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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