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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ccafd24c7c089b5f89b35a5651f3084e6f963b33e1cac0e4b3eb5186b5b2bf' 
  AND token = 'ID0wJtjmY+fXK19AutkuqlIsI0fh/859KL1gv3ABovA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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