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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb2adfb6fe4a81f397938b600e88d1bd0e429233927b3d79f87619e68ba045e' 
  AND token = '68SM6mk9UaonB1nhgIu+GrmygSbi63DBPL2eie0TkKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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