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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b28b2ac012dfa8de1f65202cac775c07d6f91f31a81f2b7a6946628dfc8d40' 
  AND token = '11dS0VJZpfpE8MF/qFpT12CQ/encchd/wH5D11FXTG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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