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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8500ccf535e4b38c5efbf73807e616fc97c69f0209320dd7cf78d5129ff54c5' 
  AND token = 'ZH+Xy6+QNTyHcxWGIBhe9G2RfgNYqmNHid97O4mjYMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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