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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd756152fa392f98ef80e7a0288bc5ed07bb478286ea02abe2cddebd97fadab7' 
  AND token = '9vNGmdOF/zxIQec5MkOmX6hyi88g73SGY0pT2nV1p2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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