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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953d7647e9e774dcf4e6ef4a77ca48a50858ea4d72232f97fbb6c244a5e73c53' 
  AND token = 'XlL9R9693lRw/ZVd3BTiD9Y6A0k56N8aoWYNOr964mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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