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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9609e4cf72aa4fdd1dc4e854d05a53e382705d4f661f1b7df970102d7cae9c' 
  AND token = 'kRwehCF4tH5Kv13n7fqTeOH9rsyn1xjNqybAS4gUpsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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