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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77bd38130782f61153a0ce3dd2197965205f33134ca36b295c17cfef58c4c5f' 
  AND token = 'BGBYKNg1xWenAXBoCBsetseyQSF8srnpzqGuWQro6Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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