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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808db47b1a5582cda0155464ccdd9e31ea1d167b095c905f58f515636febd591' 
  AND token = 'O9jpawz4P8Fp7389BAS7cnLi5avByhXsn9HKnYHYy88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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