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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfcfc0625a3e77c49043029b6d6f633a78521229fa521758f0f351dfd9cc43c' 
  AND token = '4e8J9mBxWWX+F+xTm6avffStEnqR+9dzStBdJy+XmLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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