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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311278a3e1c1fae83da4529126770fafd852383be4f7f81b3251e654f8af4926' 
  AND token = 'uqDJqvwyNBa9FtUBYUE0kWY+awm925In77Iu2sTnN9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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