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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b56fc96df6dd87e128911f49edb7d7f416ec7f1b8246fc9b801a268574fc4b' 
  AND token = '5igWCdgGFkLbpUAVm+afx/hD/7yVh30aL1s3YGf3ZEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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