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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77a4bc2169c979f2ab5baa823ace1ec8798c2a0985bf1ebc0ca5979ea6e7867' 
  AND token = 'Gv0c0RXnonDpnfEiN8zZScVj4noLLDJqoen9X4d06H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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