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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb8af8eace4782de00d5e5f56c8fbd6ec3423b0ce73167ce961f2845f363088' 
  AND token = 'Z6Ig7ilc44J4tpR9rpnDqi7jH+0bHGOExsujC7HB5dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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