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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e71a5eaedb62c9904c2cb052b1c76523ec84438578b2253b587a9115f3c8c5' 
  AND token = 'yOShrCsP1P9kJzlXlC21ObX/hioHPLK0J+tRt1G2NOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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