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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d0f5e576529105e30549d757234cc2c7ec0700a10632fbb2ed197737626cb8' 
  AND token = 'OPIr/O84Xer8EG/DVk6hHYHs2VPnmilv3rh2jcicAZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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