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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3baee996876f4245cccc80fdcf80c0f283700f84550cd447bebc52230601fc0b' 
  AND token = 'd5Gqj71fpUOAmWo4/A4gJy/8XlIEjTVWX0AtlAxo+do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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