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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae26f3774a1b6129b533c9720343c0d7d2c08dccaea9d93d0dd699336e16311' 
  AND token = 'IWhE56G+HLIA3NWGV2iSqpwB7bj//MEU30CuQxIuHrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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