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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ee9e7dde4e27daf0a6af0c7965fc0076f22a9fa785784de45aac7d88515c81' 
  AND token = 'QRR3H+Im2ZkL9m/KjvyCs8Vy0LJbdmE+1/WRC70hxQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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