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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a141573b8b9b1eb8b3609e406826dd15bdcb97ab47b4b037db36450312a1a79' 
  AND token = 'JlZHvS29BV0KCufelq7kyK1Ca4b4vM2sX6s2lDadSnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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