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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba669e9e79701ef2231858cbe3584282e1ea178ea8cce81d9c2dc0413e5a10e6' 
  AND token = 'eHlh3jVFJDU+QA2qYNwZlX32y3/uHSWWvoDG47ODjXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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