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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31a0f6ec9f074ecfcd97f7ea50d1d503da587c7d10c6fdfd0e0000be6cabf96' 
  AND token = '8T+Z++v7PU0YMqHAMhcI4TsF6s3ohP3RmdRfuGXh+ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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