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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09beec8c13f5543bd3d0abe233540f9ea0038de0d9bd9f85f2efda9653b8519b' 
  AND token = 'g8uk5lhHlz5a6glKKq8/ggJ+/FcjRuCso1B4tfme62w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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