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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18348c5711878b2ca445fa0f6f2836bce39da5402f6c9a4c43a873a62e8a91ba' 
  AND token = 'slMzl2d6VGgG1GXf5ie4tSp7AT+O82Yoh+7OuMpZj0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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