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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad9d4ac668d5c0b92c03a818960a21a7670c4a83a9401264358c26958e6ea21' 
  AND token = 'nz/h4Q1mIblvMpfvPZCB6mukNOHSU6o0Liikj7fvIoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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