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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0682b2ee59da748d6272dc085067cb5526a305fea87bc611d201ad665f032922' 
  AND token = 'ByynfVR8Cn+kne1XIk1GzPgtYBZhSW+FDUlvsoGONVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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