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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e855b76ca3600f3d6cc5f3790c3c93152ab4586e42e043793af98713051449a' 
  AND token = 'AbHLPLo6jx1YjjgyRQSGetm/DgYyG2UdgA/LdZxPOm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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