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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef30e86ad92f23efa1c09a607e438036bca9587c29ab909d200fd6d8362131c6' 
  AND token = 'duaQnmcvB4ZH4Za25Xm+GOxa+WK1s/OjvZcSatRnd6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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