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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c5f27c60be16ea7362338486555df445d3b86988e8527ff4d986fcf0d603e0' 
  AND token = 'J2wGwCEDx07UlHaQxHdethwU+pXifm9Pdnch2gyzBPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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