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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4724f88c76e1e2217addc2fdf582dbf3eb2f8407f82a4f4aa0957382618c79' 
  AND token = 'kVbMKvUznedFXHf3FLFl7FdEU6e0ecuvmP85TV00GJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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