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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbad4267e15c86e339eace4c0bb538d130921cbc34ae00083846712bd73bb206' 
  AND token = '1ZUK52OJHmN9gYKEmWI/SKiPjeDXQ1k/pvemDUC700Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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