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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fadb909d2a208ef3b6f53a63be082c018b637b0c5da8cd0eaffa66514376a1' 
  AND token = 'WT+jsnnFCkGUc1MDi+TjPhk7amhEBaPTQud6Fta8VvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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