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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ba26a7f78c4b59c05aaf969a79cad0d5237baf7121d51485ada86cada11320' 
  AND token = 'MwmJwLdGYqHq0jTxasQ4x/w3SJVwE4JKc2k8e/RkvM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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