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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c7dd516a4527cd8dfd8131818540d23077801799c840ca70803ffc95cbc156' 
  AND token = 'LFZL3LjEhwKjQ59P4Amk9LFxTNzHaHteFi+d3EXpbv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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