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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98823017684de7de3d0e3c0dd98e2f6da0ea872b9a279cea26ffa860a241ee8f' 
  AND token = 'buIwdgzNTiRPEhtaRV91VDkvDYheK1v79KkB5648LGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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