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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30da402f96f1c0c6a35a90918c1f69de8d5b54139ea04b26dd9d688f899b8acc' 
  AND token = '8Q7xAZmJpMMc+cgrhGEFYoVU2vISU+DlG/K2HGik6dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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