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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd523af5e17392ea52c62d39c3c58e00eae4b2931c61e1644c3b75ce706ec2522' 
  AND token = 'DSIB09Ug1Owj1+jBQ88vdIEJ0ENJOCsAFZIAaNw89Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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